Projection type display apparatus

1. A projection type display apparatus comprising: reflection type spatial light modulation elements provided respectively for red light, green light, and blue light, light illumination units provided respectively for red light, green light, and blue light, said light illumination units radiating respectively red light, green light, and blue light onto respective said reflection type spatial light modulation elements provided respectively for red light, green light, and blue light, wire grid polarizers provided respectively for red light, green light, and blue light, said wire grid polarizers allowing a first-polarization component included in the red light, the green light, and the blue light radiated by respective said light illumination units to pass therethrough and reflecting a second-polarization component that has been reflected and light-modulated by respective said reflection type spatial light modulation elements provided respectively for red light, green light, and blue light, housings provided respectively for red light, green light, and blue light, each of said housings taking a shape of a triangular-based hollow column defined by a triangular lower surface, a triangular upper surface, a first surface arranged inclined at an angle of 45 degrees with respect to an optical axis of the light incoming from said light illumination units, a second surface arranged perpendicular to an optical axis of the light that has passed through said wire grid polarizers, and a third surface, said first surface, said second surface, and said third surface being disposed between said triangular upper surface and said triangular lower surface, wherein said wire grid polarizers are adhered on respective said first surfaces by an adhesive, wherein said reflection type spatial light modulation elements are adhered on respective said second surfaces by said adhesive, and wherein said third surfaces are arranged so as to allow the second polarization component reflected respectively by said wire grid polarizers to pass therethrough, a color combination optical system that color-composes the red light, the green light, and the blue light of the second polarization that each have passed through respective said third surface of said housings provided respectively for red light, green light, and blue light, and allows the color-composed light to pass therethrough, and a projection lens that projects the color-composed light, wherein said adhesive has a water vapor transmission rate of 17 g/m 2 ·day or lower.

2. A projection type display apparatus as recited in claim 1 , wherein transmission type polarizing plates provided respectively for red light, green light, and blue light, said transmission type polarizing plates excluding a first polarization component included in the red light, the green light, and the blue light that have been reflected by respective said wire grid polarizers and allowing a second polarization component to pass therethrough, are adhered by said adhesive respectively on said third surfaces of said housings provided respectively for red light, green light, and blue light.

3. A projection type display apparatus as recited in claim 1 , wherein reflection type polarizing plates provided respectively for red light, green light, and blue light, said reflection type polarizing plates excluding a first polarization component included in the red right, the green light, and the blue light that have been reflected by respective said wire grid polarizers and allowing a second polarization component to pass therethrough, are adhered by said adhesive respectively on said third surfaces of said housings provided respectively for red light, green light, and blue light.

4. A projection type display apparatus as recited in claim 1 , wherein transparent glass plates provided respectively for red light, green light, and blue light, said transparent glass plates allowing the red light, green light, and blue light that have been reflected by respective said wire grid polarizers, are adhered by said adhesive respectively on said third surfaces of said housings provided respectively for red light, green light, and blue light, and wherein transmission type polarizing plates provided respectively for red light, green light, and blue light, said transmission type polarizing plates excluding a first polarization component included in the red light, the green light, and the blue light that have been reflected by respective said wire grid polarizers and allowing a second polarization component to pass therethrough, are adhered by said adhesive respectively on said incident surfaces of said color combination optical system.

5. A projection type display apparatus as recited in claim 1 , wherein a transparent glass plate allowing the red light reflected by said wire grid polarizer for red light to pass therethrough is adhered by said adhesive on said third surface of said housing for red light, wherein a transparent glass plate allowing the green light reflected by said grid polarizer for green light to pass therethrough is adhered by said adhesive on said third surface of said housing for green light, wherein a reflection type polarizing plate for blue light is adhered by said adhesive on said third surface of said housing for blue light, said reflection type polarizing plate excluding a first polarization component included in the blue light that has been reflected by said wire grid polarizer and allowing a second polarization component to pass therethrough, and wherein a transmission type polarizing plate is attached on an incident surface for red light of said color combination optical system, said transmission type polarizing plate excluding a first polarization component included in the red light that has passed through said transparent glass plate for red light, and a transmission type polarizing plate is attached on an incident surface for green light of said color combination optical system, said transmission type polarizing plate excluding a first polarization component included in the green light that has passed through said transparent glass plate for green light.

6. A projection type display apparatus as recited in claim 1 , wherein said housings are filled with inert gas at a pressure range of equal to or higher than 1 atmosphere and lower than 2 atmospheres.